I am generating classes out of xsd schemas.
I can't figure out how to tell that an object identifier should be a UUID generated in program. My error is:
Hibernate: select nextval ('hibernate_sequence') org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): com.vsetec.collect.app.generated.Balance
My code is:
<xsd:complexType name="balance">
<xsd:annotation>
<xsd:documentation>Balance Amounts</xsd:documentation>
</xsd:annotation>
<xsd:all>
<xsd:element name="comment" type="longNameString"/>
</xsd:all>
<xsd:attribute name="typeCd" type="referenceCode"/>
<xsd:attribute name="amount" type="xsd:decimal"/>
<xsd:attribute name="currencyCd" type="referenceCode"/>
<xsd:attribute name="dateLoad" type="xsd:date"/>
<xsd:attribute name="historizedOn" type="historizedDate"/>
<xsd:attribute name="id" type="uuidString" minOccurs="0">
<xsd:annotation>
<xsd:appinfo>
<jaxb:property>
<jaxb:javadoc>@hyperjaxb.hibernate.id unsaved-value="null" generator-class="uuid.hex"</jaxb:javadoc>
</jaxb:property>
<hj:id>
<!--<hj:generator generatorClass="uuid"/>-->
<orm:column name="id"/>
<!--<orm:generated-value generator="uuid"/>-->
</hj:id>
</xsd:appinfo>
</xsd:annotation>
</xsd:attribute>
</xsd:complexType>
upd start This generates the following in my java:
/**
* @hyperjaxb.hibernate.id unsaved-value="null" generator-class="uuid.hex"
*
* @return
* possible object is
* {@link String }
*
*/
@Id
@Column(name = "id", length = 32)
public String getId() {
return id;
}
If I add
<orm:generated-value generator="uuid"/>
, it says something like "there is no generator by the name uuid"
If I add
<hj:generator generatorClass="uuid"/>
, nothing is really added, no annotation to add a UUID generator or anything. I did a search for "uuid" substring so I know. The above mentioned error remains.
I want to make Hibernate to generate an identfier as a UUID. The doc says it is achieved with annotations like the following:
@Id
@GeneratedValue
public UUID id;
The documentation is here:
It describes how a field of UUID type should be annotated. I guess it is another layer of questions on how to map UUID fields in Jaxb, so I would first try to map it as a hex String, for example. But if you have a working solution for this problem which is far from uncommon, it would be useful for everybody.
upd end
Previously with HBM I did this like the following:
<class entity-name="Balance">
<cache usage="read-write"/>
<comment>
Balance Amounts
</comment>
<id name="id" type="string" length="32">
<generator class="uuid"/>
</id>
<property name="currencyCd" type="string" length="32"/>
<property name="amount" type="big_decimal"/>
<property name="comment" type="string" length="255"/>
<property name="historizedOn" type="date"/>
</class>
upd
I have no idea what annotations this xml mapping corresponds to, but it worked. It seems that it attaches a UUID generator to a String field. I can't say what was the class definition because I used "dynamic-maps". My task is just to switch from HBM and dynamic maps to Hyperjaxb and generated classes.
ANSWER (in a form of an answer rather that a vague rtfm style hint)
<xsd:attribute name="id" type="uuidString" minOccurs="0">
<xsd:annotation>
<xsd:appinfo>
<hj:id>
<orm:column name="id"/>
<orm:generated-value generator="uuid"/>
</hj:id>
<annox:annotate>
<ha:GenericGenerator name="uuid" strategy="uuid2"/>
</annox:annotate>
</xsd:appinfo>
</xsd:annotation>
</xsd:attribute>
uuidString should be of 36 characters long
ps. there is still a problem with mass inserts (suspect uuid dupes, but yet not sure
You can generate @GeneratedValue with a customization like:
<hj:id>
<orm:generated-value strategy="..." generator="..."/>
</hj:id>
You've tried this with generator="uuid" and got something like "generator uuid is not known". This is probably because you also need to actually configure a generator for the name uuid, like in Hibernate docs:
@GenericGenerator(
name = "uuid",
strategy = "org.hibernate.id.UUIDGenerator",
parameters = {
@Parameter(
name = "uuid_gen_strategy_class",
value = "org.hibernate.id.uuid.CustomVersionOneStrategy"
)
}
)
This is, however, not a standard JPA annotation so HJ3 does not generate it. You can use the jaxb2-annotate-plugin to add this annotation.
Disclaimer: I'm the author of Hyperjaxb3 and jaxb2-annotate-plugin.